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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrStencilBuffer_DEFINED
#define GrStencilBuffer_DEFINED
#include "GrClipData.h"
#include "GrGpuResource.h"
class GrRenderTarget;
class GrResourceKey;
class GrStencilBuffer : public GrGpuResource {
public:
SK_DECLARE_INST_COUNT(GrStencilBuffer);
virtual ~GrStencilBuffer() {
// TODO: allow SB to be purged and detach itself from rts
}
int width() const { return fWidth; }
int height() const { return fHeight; }
int bits() const { return fBits; }
int numSamples() const { return fSampleCnt; }
// called to note the last clip drawn to this buffer.
void setLastClip(int32_t clipStackGenID,
const SkIRect& clipSpaceRect,
const SkIPoint clipSpaceToStencilOffset) {
fLastClipStackGenID = clipStackGenID;
fLastClipStackRect = clipSpaceRect;
fLastClipSpaceOffset = clipSpaceToStencilOffset;
}
// called to determine if we have to render the clip into SB.
bool mustRenderClip(int32_t clipStackGenID,
const SkIRect& clipSpaceRect,
const SkIPoint clipSpaceToStencilOffset) const {
return fLastClipStackGenID != clipStackGenID ||
fLastClipSpaceOffset != clipSpaceToStencilOffset ||
!fLastClipStackRect.contains(clipSpaceRect);
}
// Places the sb in the cache. The cache takes a ref of the stencil buffer.
void transferToCache();
static GrResourceKey ComputeKey(int width, int height, int sampleCnt);
protected:
GrStencilBuffer(GrGpu* gpu, bool isWrapped, int width, int height, int bits, int sampleCnt)
: GrGpuResource(gpu, isWrapped)
, fWidth(width)
, fHeight(height)
, fBits(bits)
, fSampleCnt(sampleCnt)
, fLastClipStackGenID(SkClipStack::kInvalidGenID) {
fLastClipStackRect.setEmpty();
}
private:
int fWidth;
int fHeight;
int fBits;
int fSampleCnt;
int32_t fLastClipStackGenID;
SkIRect fLastClipStackRect;
SkIPoint fLastClipSpaceOffset;
typedef GrGpuResource INHERITED;
};
#endif
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